20∼30대의 가족건강성이 심리적 안녕감에 미치는 영향 -적극적 스트레스 대처와 회복탄력성의 순차적 매개효과-

권혜진 ( Kwon¸ Hyejin ),신효정 ( Shin¸ Hyojung ) 한국가족사회복지학회 2021 한국가족복지학 Vol.68 No.3

본 연구에서는 20∼30대의 가족건강성과 심리적 안녕감의 관계에서 적극적 스트레스 대처와 회복탄력성의 순차적인 매개효과를 검증하고자 하였다. 연구를 위해 20∼30대 성인 326명을 대상으로 자기보고식 설문을 실시하였으며 연구 결과는 다음과 같다. 첫째, 가족건강성과 적극적 스트레스 대처, 회복탄력성, 심리적 안녕감은 모두 유의한 정적 상관이 나타났다. 둘째, 가족건강 성과 심리적 안녕감 사이에서 적극적 스트레스 대처와 회복탄력성의 순차적 매개효과가 나타났다. 이를 통해 건강한 가족관계가 스트레스를 적극적으로 대처할 수 있는 힘을 키워주며, 역경을 이겨내는 회복탄력성이 성장함으로써 심리적 안녕감이 증진되는 것을 알 수 있다. 또한 가족건강성이 심리적 안녕감에 미치는 직접효과보다 적극적 스트레스 대처와 회복탄력성을 통한 간접효과가 더 큰 결과는 비록 가족건강성이 낮더라도 적극적 스트레스 대처와 회복탄력성 증진 교육의 개입을 통해 20~30대의 심리적 안녕감을 높일 수 있음을 시사한다. This study tried to verify the sequential mediating effects of active stress coping and resilience in the relationship between family-strengths and psychological well-being in the 20s and 30s. For the study, a self-report questionnaire was conducted on 326 adults in their 20s and 30s, and the results of the study are as follows. First, there was a significant positive correlation between family-strengths, active stress coping, resilience, and psychological well-being. Second, there was a sequential mediating effect of active stress coping and resilience between family-strengths and psychological well-being. Through this, it can be seen that a healthy family relationship develops the ability to actively cope with stress, and through this, the psychological well-being is enhanced by the growth of resilience to overcome adversity. This suggests that even if family-strengths is low, psychological well-being in 20s and 30s can be increased through active stress coping and intervention in resilience-enhancing education. Finally, a discussion for future research is presented.

The Effects of Ambient Ions on the Growth of Gold Nanoparticles by Laser Ablation in Liquid

Kwon, Hyejin,Kim, Kuk Ki,Song, Jae Kyu,Park, Seung Min Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3

Gold nanoparticles (AuNPs) were synthesized by laser (Nd:YAG, ${\lambda}$ = 1064 nm) ablation of a gold target immersed in various aqueous electrolyte solutions (7 mM of LiCl, NaCl, KCl, NaBr, and NaI) as well as in deionized water. The surface plasmon absorption and EDX of AuNPs so produced as well as their TEM images were analyzed to investigate the effects of ambient ions on the growth and aggregation of NPs. The size of AuNPs was reduced by laser ablation in the presence of chloride and bromide ions while it increased drastically when AuNPs were formed in iodide solution. Interestingly, triangular nanoplates were synthesized only in iodide solution. Surface chemistry on AuNPs in various electrolyte solutions was explored to elucidate the role of ions on the size and stability of AuNPs.

Extracellular Vesicles Released by Lactobacillus paracasei Mitigate Stress-induced Transcriptional Changes and Depression-like Behavior in Mice

Kwon Hyejin,이은화,최주리,박진영,김윤근,Han Pyung-Lim 한국뇌신경과학회 2023 Experimental Neurobiology Vol.32 No.5

Various probiotic strains have been reported to affect emotional behavior. However, the underlying mechanisms by which specific probiotic strains change brain function are not clearly understood. Here, we report that extracellular vesicles derived from Lactobacillus paracasei (Lpc -EV) have an ability to produce genome-wide changes against glucocorticoid (GC)-induced transcriptional responses in HT22 hippocampal neuronal cells. Genome-wide analysis using microarray assay followed by Rank-Rank Hypergeometric Overlap (RRHO) method leads to identify the top 20%-ranked 1,754 genes up- or down-regulated following GC treatment and their altered expressions are reversed by Lpc -EV in HT22 cells. Serial k -means clustering combined with Gene Ontology enrichment analyses indicate that the identified genes can be grouped into multiple functional clusters that contain functional modules of “responses to stress or steroid hormones”, “histone modification”, and “regulating MAPK signaling pathways”. While all the selected genes respond to GC and Lpc -EV at certain levels, the present study focuses on the clusters that contain Mkp-1 , Fkbp5 , and Mecp2 , the genes characterized to respond to GC and Lpc -EV in opposite directions in HT22 cells. A translational study indicates that the expression levels of Mkp-1 , Fkbp5 , and Mecp2 are changed in the hippocampus of mice exposed to chronic stress in the same directions as those following GC treatment in HT22 cells, whereas Lpc -EV treatment restored stress-induced changes of those factors, and alleviated stress-induced depressive-like behavior. These results suggest that Lpc -EV cargo contains bioactive components that directly induce genome-wide transcriptional responses against GC-induced transcriptional and behavioral changes.

Comparison of the bite force and occlusal contact area of the deviated and non-deviated sides after intraoral vertical ramus osteotomy in skeletal Class III patients with mandibular asymmetry: Two-year follow-up

Kwon Hyejin,Park Sun-Hyung,Jung Hoi-In,Hwang Woo-Chan,Choi Yoon Jeong,Chung Chooryung,Kim Kyung-Ho 대한치과교정학회 2022 대한치과교정학회지 Vol.52 No.3

Objective: The objectives of this study were to compare the time-dependent changes in occlusal contact area (OCA) and bite force (BF) of the deviated and non-deviated sides in mandibular prognathic patients with mandibular asymmetry before and after orthognathic surgery and investigate the factors associated with the changes in OCA and BF on each side. Methods: The sample consisted of 67 patients (33 men and 34 women; age range 15–36 years) with facial asymmetry who underwent 2-jaw orthognathic surgery. OCA and BF were taken before presurgical orthodontic treatment, within 1 month before surgery, and 1 month, 3 months, 6 months, 1 year, and 2 years after surgery. OCA and BF were measured using the Dental Prescale System. Results: The OCA and BF decreased gradually before surgery and increased after surgery on both sides. The OCA and BF were significantly greater on the deviated side than on the non-deviated side before surgery, and there was no difference after surgery. According to the linear mixed-effect model, only the changes in the mandibular plane angle had a significant effect on BF (p < 0.05). Conclusions: There was a difference in the amount of the OCA and BF between the deviated and non-deviated sides before surgery. The change in mandibular plane angle affects the change, especially on the non-deviated side, during the observation period.

A Data Hiding Scheme for Grayscale Images Using a Square Function

Kwon, Hyejin,Kim, Haemun,Kim, Soonja Korea Multimedia Society 2014 멀티미디어학회논문지 Vol.17 No.4

Many image hiding schemes based on least significant bit (LSB) transformation have been proposed. One of the LSB-based image hiding schemes that employs diamond encoding was proposed in 2008. In this scheme, the binary secret data is converted into base n representation, and the converted secret data is concealed in the cover image. Here, we show that this scheme has two vulnerabilities: noticeable spots in the stego-image, i.e., a non-smooth embedding result, and inefficiency caused by rough re-adjustment of falling-off-boundary value and impractical base translation. Moreover, we propose a new scheme that is efficient and produces a smooth and high quality embedding result by restricting n to power of 2 and using a sophisticated re-adjustment procedure. Our experimental results show that our scheme yields high quality stego-images and is secure against RS detection attack.

A Data Hiding Scheme for Grayscale Images Using a Square Function

Hyejin Kwon,Haemun Kim,Soonja Kim 한국멀티미디어학회 2014 멀티미디어학회논문지 Vol.17 No.4

Lactobacillus-derived extracellular vesicles counteract Aβ42-induced abnormal transcriptional changes through the upregulation of MeCP2 and Sirt1 and improve Aβ pathology in Tg-APP/PS1 mice

Kwon Hyejin,Lee Eun-Hwa,Park So Young,Park Jin-Young,Hong Jin-Hwan,Kim Eun-Kyung,Shin Tae-Seop,김윤근,Han Pyung-Lim 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Mounting evidence suggests that probiotics are beneficial for treating Alzheimer’s disease (AD). However, the mechanisms by which specific probiotics modify AD pathophysiology are not clearly understood. In this study, we investigated whether Lactobacillus paracasei-derived extracellular vesicles (Lpc-EV) can directly act on neuronal cells to modify amyloid-beta (Aβ)-induced transcriptional changes and Aβ pathology in the brains of Tg-APP/PS1 mice. Lpc-EV treatment in HT22 neuronal cells counteracts Aβ-induced downregulation of Brain-derived neurotrophic factor (Bdnf), Neurotrophin 3 (Nt3), Nt4/5, and TrkB receptor, and reverses Aβ-induced altered expression of diverse nuclear factors, including the downregulation of Methyl-CpG binding protein 2 (Mecp2) and Sirtuin 1 (Sirt1). Systematic siRNA-mediated knockdown experiments indicate that the upregulation of Bdnf, Nt3, Nt4/5, and TrkB by Lpc-EV is mediated via multiple epigenetic factors whose activation converges on Mecp2 and Sirt1. In addition, Lpc-EV reverses Aβ-induced downregulation of the Aβ-degrading proteases Matrix metalloproteinase 2 (Mmp-2), Mmp-9, and Neprilysin (Nep), whose upregulation is also controlled by MeCP2 and Sirt1. Lpc-EV treatment restores the downregulated expression of Bdnf, Nt4/5, TrkB, Mmp-2, Mmp-9, and Nep; induces the upregulation of MeCP2 and Sirt1 in the hippocampus; alleviates Aβ accumulation and neuroinflammatory responses in the brain; and mitigates cognitive decline in Tg-APP/PS1 mice. These results suggest that Lpc-EV cargo contains a neuroactive component that upregulates the expression of neurotrophic factors and Aβ-degrading proteases (Mmp-2, Mmp-9, and Nep) through the upregulation of MeCP2 and Sirt1, and ameliorates Aβ pathology and cognitive deficits in Tg-APP/PS1 mice.

유아주도놀이 실천에 대한 교사의 인식과 딜레마

권혜진(Kwon Hyejin) 한국어린이미디어학회 2020 어린이미디어연구 Vol.19 No.2

본 연구는 유아주도놀이 실천에 대한 유아교사의 인식과 딜레마를 탐색해 봄으로 유아교육현장에서 유아중심교육과정을 내실화하고 유아주도놀이를 활성화하는데 기초자료를 제공하고자 수행되었다. 이를 위해 2019년 3월 3주부터 6월 4주에 걸쳐 10명의 교사를 대상으로 면담을 실시하였다. 면담 내용은 녹음되고 전사하였다. 수집된 녹음자료는 전사하여 질적 분석을 실시하였다. 연구결과 첫째, 교사들은 유아주도 놀이 실천은 당연하다는 인식을 보였다. 그럼에도 유아주도놀이가 교사의 역할을 방임하는 것은 아닌지 혼돈과 갈등의 모습을 보였다. 둘째, 교사들은 유아주도 놀이를 통해 유아들이 즐거움을 느끼는 점은 인식하고 있었다. 그러나, 자유로운 형식에 의한 유아주도놀이로 인하여 소외되는 유아들도 존재하며 이를 어떻게 해결해야 하는지 고민하는 모습을 나타내었다. 셋째, 교사들은 유아주도놀이를 충실히 실천하는데 부모, 동료 교사, 원장의 평가를 인식하고 있어 조급함과 불안감을 나타내었다. 이상의 연구결과를 중심으로 유아주도 실천을 위한 교사 역할을 논의하였다. This study was conducted to explore the perceptions and dilemmas of early childhood teachers about child-led play and to provide basic data on invigorating child-led play in the field of early childhood education. To that end, 10 teachers had been interviewed from the 3rd week of March to the 4th week of June in 2019. The interviews were recorded, and the recordings were transcribed. The collected recordings were analyzed using qualitative methods. The results of this study are as follows. First, teachers have shown that it is natural to practice child-led play. Nevertheless, they have expressed confusion and conflict over whether the child-led play neglects the role of the teaches. Second, teachers recognized the joys of children through child-led play experiences. However, there are also children who are left out due to free form of child-led play, and teachers seem to be considering how to solve it. Third, Teachers felt a sense of impatience and anxiety as they recognized the evaluations of children’s parents, peer teachers and directors in faithfully practicing child-led play.Based on the above findings, we discussed the role of teachers in the practice of child-led play was discussed.

코로나19(COVID-19) 감염증에 대응하는 보육교사의 영유아 건강관리직무와 수행 경험

권혜진(Kwon Hyejin) 한국어린이미디어학회 2021 어린이미디어연구 Vol.20 No.1

본 연구는 보육교사가 수행하고 있는 코로나19 감염증 대응 건강관리직무를 살펴보고자 수행되었다. 이를 위하여 8명의 보육교사를 대상으로 심층면담을 실시하였다. 연구참여자와의 면담내용은 녹음되었고 녹음자료는 전사하여 질적분석을 실시하였다. 연구결과 첫째, 보육교사들의 코로나 대응 건강사정직무로 영유아 관찰, 체온 측정, 부모와 쪽지 통신 등을 실시하였다. 둘째, 보육교사들의 코로나 대응 건강문제조치를 위한 직무로 감염증 질환 의심되는 영유아 발생 시 즉시 다른 영유아로부터 격리 및 부모에게 연락 긴급 보육실시 등을 실시하였다. 셋째, 보육교사들의 코로나19 대응 건강교육직무로 영유아, 부모, 보육교직원 대상 감영병 예방교육 등을 실시하였다. 넷째, 보육교사들의 코로나19 대응 문서 및 환경관리 업무로 영유아 건강검진 서류 관리, 코로나 대응 지침 관리, 공용 공간 청결, 환경, 방역 관리하기 등의 업무를 수행하고 있는 것으로 나타났다. 다섯째, 보육교사들의 코로나19 대응 보육교사의 자가건강관리로 자가격리, 직무 스트레스 관리하기 직무를 수행하고 있는 것으로 나타났다. 이상의 결과를 중심으로 영유아교육현장에서 보육교사가 수행하는 코로나19 대응 건강관리직무의 개선 방향을 논의하였다. This study was conducted to examine the health management duties of child care teachers for young children in response to COVID-19. For this, in-depth interviews were conducted with eight teachers. Collected data were transcribed, and qualitative analysis was conducted. The results are as follows. First, child care teachers’ monitoring duties for young children in response to COVID-19 were conducted, such as checking the young children’s condition, and body temperature. Second, child care teachers’ health problem action duties for young children in response to COVID-19 were conducted, such as immediately isolated young children and parents from other young children and contacted them to conduct emergency child care services in case of suspected infectious diseases. Second, as health problem duties for child in response to COVID-19, care teachers isolated young children suspected infectious diseases from other children. Third, child care teachers’ preventive education duties in response to COVID-19 were conducted for children, parents, and child care teachers themselves. Fourth, child care teachers were carrying out duties such as managing documents for young children’s health examination, and managing guidelines for COVID-19 response. Fifth, child care teachers performed such as self-isolation, and self-management for response to COVID-19. Based on the above results, measures were proposed to reduce work and to support physical and mental health to perform COVID-19 corresponding child care teachers’ health management duties. Based on the above results, measures were proposed to reduce work and to support physical and mental health to perform COVID-19 corresponding child care teachers’ health management duties.

조직 내 역할갈등이 직무만족에 미치는 영향 : 경쟁성향과 경쟁풍토의 조절효과 및 인지부조화의 매개효과

권혜진(Hyejin Kwon),박지혜(Jihye Park),김선혁(Sunhyuk Kim) 중앙대학교 한국인적자원개발전략연구소 2021 역량개발학습연구 Vol.16 No.3

본 연구는 조직구성원이 조직에서 요구받는 역할과 실제 수행하고자 하는 역할 간 갈등을 의미하는 역할갈등에 초점을 맞추어 역할갈등이 조직구성원의 직무만족에 미치는 영향을 분석하였다. 역할갈등과 직무만족 간 관계를 매개하는 변수로 인지부조화를 제시하였는데, 이를 통해 역할갈등이 구체적으로 어떤 프로세스를 거쳐 조직구성원의 직무만족에 영향을 미치는 지에 대하여도 검증하였다. 본 연구는 역할갈등과 인지부조화 간의 관계를 분석함에 있어서 구성원 개인의 경쟁성향과 구성원이 속해 있는 팀내 경쟁풍토가 영향을 미칠 것으로 보고, 개인 경쟁성향과 팀내 경쟁풍토에 대한 조절효과에 대한 가설을 수립하고 검증하였다. 역할갈등이 인지부조화를 통해서 직무만족에 이르는 간접효과가 개인 경쟁성향과 팀내 경쟁풍토의 정도에 따라 다를 것으로 생각하고 조절된 매개효과를 분석하였다. 가설검증을 위해 D지역의 공기업과 사기업 구성원들을 대상으로 246부의 자료를 수집하여 분석하였다. 분석 결과, 역할갈등은 직무만족을 낮추고, 인지부조화가 두 변수를 매개하는 것으로 나타났다. 조절효과에 대한 가설 중, 팀내 경쟁풍토의 조절효과에 대한 가설은 지지되었으나, 개인 경쟁성향의 조절효과에 대한 가설은 기각되었다. 개인 경쟁성향과 팀내 경쟁풍토의 조절된 매개효과에서도 팀내 경쟁풍토의 가설은 지지되었으나, 개인 경쟁성향의 가설은 지지되지 않았다. 이와 같은 분석결과를 통해 본 연구는 직무만족을 촉진하기 위해 역할갈등의 관리가 중요함을 확인하였다. 인지부조화의 매개역할과 개인 경쟁성향 및 팀내 경쟁풍토의 조절된 매개변수 역할을 확인함으로써 역할갈등이 직무만족에 미치는 새로운 경로의 연구로써 이해의 폭을 확장하였다. This study investigated the relationship between role conflict and job satisfaction and examined whether cognitive dissonance mediated between role conflict and job satisfaction. Furthermore, the moderating role of trait competitiveness and competitive team climate in the relationship between role conflict and job satisfaction was also investigated. By developing a moderated mediation model, the conditional indirect effect of trait competitiveness and competitive team climate on the relationship between role conflict and job satisfaction via cognitive dissonance was analyzed. To test the hypothesis, 246 copies of the data were collected and analyzed from members of public and private companies in region D. The result of empirical analysis regarding role conflict was significantly negatively related to job satisfaction. It was also found that cognitive dissonance mediated the relationship between role conflict and job satisfaction. In addition, there was also a significant moderating effect of the competitive team climate on the relationship between role conflict and cognitive dissonance. The moderated mediating role of competitive team climate was also shown yet the moderating effect of trait competitiveness was not supported. Based on these results, this study confirmed the importance of role conflict management to promote job satisfaction. Also, by confirming the mediating role of cognitive dissonance and the moderated mediating role of competitive team climate, the scope of understanding was expanded as a study of new paths in role conflict on job satisfaction.